About testosterone undecanoate
Long-acting testosterone replacement therapy
Used for
- Testosterone replacement in adult men with confirmed hypogonadism.
Usual adult dose
One deep muscle injection, repeated after 6 weeks; then usually every 10–14 weeks, adjusted by blood tests.
Common side effects
- Acne or oily skin
- Weight gain or fluid retention
- Injection-site pain
- Raised red blood cell count
Important warnings
- For men with confirmed testosterone deficiency; not for bodybuilding or fertility treatment.
- Injections can rarely cause sudden breathing problems or allergic reactions.
- May worsen prostate or urinary problems; regular monitoring is needed.
- Can reduce sperm production and fertility.
Pregnancy
Not applicable; this medicine is not for women and can harm a developing fetus.
Breastfeeding
Not applicable; this medicine is not for women who are breastfeeding.
Interactions
- Blood thinners, such as warfarin, may require closer monitoring.
- Insulin and diabetes medicines may need adjustment.
- Some corticosteroids may increase fluid retention.
- Enzyme-inducing medicines, such as rifampicin, can affect testosterone levels.
AI-generated from general medical knowledge, not from this product's official leaflet. It may be incomplete or out of date. Not medical advice — ask a pharmacist or doctor before making any decision.